package P19;

/**
 * @Author DJ同学
 * @Date 2021/2/23 23:17
 * @Version 1.0
 */
public class ListNode {
    int val;
      ListNode next;
      ListNode() {}
      ListNode(int val) { this.val = val; }
      ListNode(int val, ListNode next) { this.val = val; this.next = next; }
}
